Question

Gaira was asked to evaluate the algebraic

expression –3.8x + 6 when x = –7.5.

–3.8(–7.5) + 6(–7.5)

28.5 + (–45)

(–16.5)

What mistake did she make

Answer 1

Answer: Gaira made a mistake when substituting the value –7.5 in for x. She multiplied both terms of the expression by –7.5 when she should have only multiplied –3.8 by –7.5. The correct answer is 34.5.

Explanation:

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