20x²-17x-63 find the root
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Factorization
Step-by-step explanation:
= 20x^2- 17x - 63
= 20x^2 - 45x + 28x - 63
= 5x( 4x - 9) + 7(4x - 9)
= (4x - 9) (5x + 7)
therefore 4x - 9 = 0 and 5x +7 = 0
x = 9/4 and x = -7/5
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