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- Solve for x in x2-3x-10 = 0
Question 1:
Solve for x in x2-3x-10 = 0 A. 2, 5
B. 5, -2
Feedback Let us express -3x as a sum of -5x and +2x.
x2-5x+2x-10 = 0
x(x-5)+2(x-5) = 0
(x-5)(x+2) = 0
x-5 = 0 or x+2 = 0
x = 5 or x = -2
x2-5x+2x-10 = 0
x(x-5)+2(x-5) = 0
(x-5)(x+2) = 0
x-5 = 0 or x+2 = 0
x = 5 or x = -2
C. 4, 7
D. 8,9
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