Question

1. Evaluate:
(a) If P = 18a2-7ab + 6b2 and Q =-6a² + 5ab-2b2, find (2P-Q)-(P-20).​

Answer 1

Explanation:

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................... .

. ....

Answer 2

Given that, P = 18a²-7ab+6b² and,

Q = 6a²+5ab-2b²

Find ( 2P-Q)-(P-20).

so,

2[(18a²-7ab+6b²-6a²+5ab-2b²) - ( 18a²-7ab+6b²-20)

36