(x + 5) is a factor of 2x3 + 5x2 - 28x - 15.
Hence, factorise the expression
2x3 + 5x2 – 28x – 15 completely.
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Step-by-step explanation:
=2(-5)3 + 5(-5)2 - 28(-5) - 15
= -30 - 50 + 140 - 15
= -80 + 135
= 55
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