Q7 of 90 Page 115

Solve:


By cross multiplication, 17(2x + 7) = 15(3x + 5)


⇒ (34x + 119) = 45x + 75


⇒ 11x = 44


⇒ x = 4


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Evaluate {(83)2 - (17)2}.

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Factorize:

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(iv)

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5 years ago a man was 7 times as old as his son. After 5 years he will be thrice as old as his son. Find their present ages.

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ab - a - b + 1 = ?