a) Simplify :-
(2x + 7) (5x +9) - (4.x² + 1) (x-3)
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Answer:
66 + 52x + 22x² - 4x³
Step-by-explanation:-
=> (2x + 7) (5x + 9) - (4x² + 1)(x - 3)
=> (10x² + 53x + 63) - (4x³ - 12x² + x - 3)
=> 10x² + 53x + 63 - 4x³ + 12x² - x + 3
=> 10x² + 12x² + 53x - x - 4x³ + 3 + 63
=> 22x² + 52x + 66 - 4x³
.
. . 66 + 52x + 22x² - 4x³
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