if a=5 b=-4 the value of 64a3 + 125b3 + 240, a2b + 300ab3 is equal to??
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(-5x2 - 8x + 7) - (5x2 - 4)
= -5x2 - 8x + 7 - 5x2 + 4
= -5x2 - 5x2 - 8x + 7 + 4
= -10x2 – 8x + 11
Answer - 10x2 – 8x + 11
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Question. 2
(4x2 + 5x) + (x2 - 5x + 1)
= 4x2 + 5x + x2 - 5x + 1
= 4x2 + x2+ 5x - 5x + 1
= 5x2 + 0 + 1
= 5x2 + 1
Answer: 5x2 + 1
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Question. 3
(6x + 3) - (-x2 + 5x)
= -6x + 3 + x2 - 5x
= -6x - 5x + x2 + 3
= x2 – 11x + 3
Answer: x2 – 11x + 3
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Question. 4
(9x - 5) - (-9x2 + x - 5)
= -9x - 5 + 9x2 - x + 5
= 9x2 - 9x – x – 5 + 5
= 9x2 – 10x
= x(9x – 10)
Answer: x(9x – 10)
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