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Question

Evaluate 9x2+19x2 if (3x+13x)=83

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Solution

(3x+13x)=83
Squaring both sides
(3x+13x)2=(83)2

(3x)2+(13x2)+2(3x)(13x)=649

9x2+19x2+2=649

9x2+19x2=6492


9x2+19x2=64189

9x2+19x2=469

1190558_1348398_ans_a7e3178e4f234a368a178327481adbc9.jpg

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