## Step 1 :

Trying to aspect by dividing the middle term1.1Factoring x2+2x-64 The an initial term is, x2 the coefficient is 1.The middle term is, +2x that is coefficient is 2.The last term, "the constant", is -64Step-1 : main point the coefficient the the very first term by the constant 1•-64=-64Step-2 : discover two determinants of -64 whose sum equals the coefficient that the center term, i beg your pardon is 2.

 -64 + 1 = -63 -32 + 2 = -30 -16 + 4 = -12 -8 + 8 = 0 -4 + 16 = 12 -2 + 32 = 30 -1 + 64 = 63

Observation : No two such factors can be uncovered !! Conclusion : Trinomial deserve to not be factored

Equation in ~ the finish of step 1 :

x2 + 2x - 64 = 0

## Step 2 :

Parabola, recognize the Vertex:2.1Find the crest ofy = x2+2x-64Parabolas have a greatest or a lowest point called the Vertex.Our parabola opens up up and accordingly has a lowest point (AKA pure minimum).We know this even prior to plotting "y" due to the fact that the coefficient the the an initial term,1, is optimistic (greater 보다 zero).Each parabola has a vertical line of symmetry that passes v its vertex. Therefore symmetry, the line of symmetry would, for example, pass through the midpoint that the two x-intercepts (roots or solutions) the the parabola. That is, if the parabola has actually indeed two genuine solutions.Parabolas have the right to model plenty of real life situations, such together the height above ground, of an item thrown upward, after ~ some duration of time. The crest of the parabola can provide us through information, such as the maximum height that object, thrown upwards, have the right to reach. For this reason we desire to be able to find the collaborates of the vertex.For any type of parabola,Ax2+Bx+C,the x-coordinate the the crest is given by -B/(2A). In our instance the x coordinate is -1.0000Plugging right into the parabola formula -1.0000 for x we deserve to calculate the y-coordinate:y = 1.0 * -1.00 * -1.00 + 2.0 * -1.00 - 64.0 or y = -65.000

Parabola, Graphing Vertex and X-Intercepts :

Root plot for : y = x2+2x-64 Axis of symmetry (dashed) x=-1.00 Vertex at x,y = -1.00,-65.00 x-Intercepts (Roots) : source 1 in ~ x,y = -9.06, 0.00 source 2 in ~ x,y = 7.06, 0.00

Solve Quadratic Equation by completing The Square

2.2Solvingx2+2x-64 = 0 by perfect The Square.Add 64 come both next of the equation : x2+2x = 64Now the clever bit: take the coefficient that x, i beg your pardon is 2, division by two, offering 1, and also finally square it providing 1Add 1 to both sides of the equation :On the ideal hand side we have:64+1or, (64/1)+(1/1)The usual denominator the the two fractions is 1Adding (64/1)+(1/1) provides 65/1So including to both political parties we finally get:x2+2x+1 = 65Adding 1 has actually completed the left hand side right into a perfect square :x2+2x+1=(x+1)•(x+1)=(x+1)2 things which are equal come the same thing are also equal come one another. Sincex2+2x+1 = 65 andx2+2x+1 = (x+1)2 then, follow to the regulation of transitivity,(x+1)2 = 65We"ll describe this Equation as Eq.

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#2.2.1 The Square source Principle claims that once two things are equal, your square roots room equal.Note that the square source of(x+1)2 is(x+1)2/2=(x+1)1=x+1Now, applying the Square source Principle to Eq.#2.2.1 us get:x+1= √ 65 Subtract 1 indigenous both political parties to obtain:x = -1 + √ 65 due to the fact that a square root has actually two values, one positive and the other negativex2 + 2x - 64 = 0has 2 solutions:x = -1 + √ 65 orx = -1 - √ 65