3 years ago

Prove that 3(x+1)(x+7)-2x+5)^2 is never positive

Mathematics

1 answer:

lisov135 [29]3 years ago

5 0

Answer:

Yes, 3(x+1)(x+7)-(2x+5)² is never positive

Step-by-step explanation:

So....

3(x+1)(x+7)-(2x+5)(2x+5)

=3(x²+8x+7)-(4x²+20x+25)

=3x²+24x+21-4x²-20x-25

=-x²+4x-4

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