7. Simplify:
(ii) (2x + 7) (5x + 9) - (4x^2 + 1)(x - 3)
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Answer:
4x³+22x²+19x+95
Step-by-step explanation:
2x(5x+9)+7(5x+9)-4x²(x-3)+1(x-3)
=10x²+18x+35+63+4x³+12x²+x-3
=4x³+10x²+12x²+18x+x+35+63-3
=4x³+22x²+19x+95
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