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? What is the correct answer?.

Answer 1

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 value of the expression is 34.5.

Given

Gaira was asked to evaluate the algebraic;

–3.8x + 6 when x = –7.5.

What is an algebraic expression?

Algebraic expressions consist of numbers and variables along with operational signs.

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.

To solve the following expression follow all the steps given below.

Then,

The correct expression is;

$=-3.8x + 6\\\\\text{Substitute the value of x = -7.5}\\\\= -3.8(-7.5)+6\\\\= 28.5+6\\\\=34.5$

Hence, the value of the expression is 34.5.

To know more about Algebraic expression click the link given below.

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