Competition problem — Algebra — Maths Olympiad Prep

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Algebra Difficulty 1.9 Junior Find the answer

Evaluate the expression $2x^{2}+3x^{2}$ when $x=2$ .

Your answer

A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.

Solution

When $x=2$ , we obtain $2x^{2}+3x^{2}=5x^{2}=5 \cdot 2^{2}=5 \cdot 4=20$ .

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