solve the following 11.24:-7.8
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Answer. The given expression is 7x – 6x2 + 20.
(Co-efficient of x2 = -6, co-efficient of x = 7 and the constant term = 20)
We will split the co-efficient of x into two parts such that their sum is -19 and their product equals to the product of the co-efficient of x2 and the constant term, i.e., (– 6) × 20 = – 120
Now,
(15) + (- 8) = 7 And (15) × (-8) = -120
Replacing the middle term 7x by 15x - 8x, we have:
7x – 6x2 + 20 = – 6x2 + 15x - 8x + 20
= (-6x2 + 15x) + (- 8x + 20)
= 3x (-2x + 5) + 4(- 2x + 5)
= (-2x + 5)(3x + 4)
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Answer:
solve the following answer 1.44102564102564
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