factorise 3x²-4x-15 by x - 3
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o
Step-by-step explanation:
let (x - 3) is factor of the polynomial 3x²-4x-15
so,
x - 3 = 0
x = 3
put the value of x in polynomial 3x²-4x-15
= 3(3)² - 4×3 - 15
= 27 - 12 - 15
= 15-15
= 0
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