MATHEMATICS MIDDLE SCHOOL

Rob and Lila try to simplify 18 x 4² + (9 - 3)². Rob simplifies the expression and gets 360. Lila simplifies it and gets 324. Which student is correct? What error did the other student make?

Answers

Answer 1

Answer:

Answer:

Lila is correct and Rob is incorrect because she apply wrong property.

$18 * 4^2+(9-3)^2=324$

Step-by-step explanation:

Given : Rob and Lila try to simplify $18 * 4^2+(9-3)^2$

Rob simplifies the expression and gets 360. Lila simplifies it and gets 324.

To find : which student is correct and what error did the other student.

Solution: First we simplify the expression:

$18 * 4^2+(9-3)^2$

$=18 * 16+(6)^2$

$=288+36$

$=324$

The solution of the expression is 324 which means Lila simplifies correct.

The mistake is found in Rob,

She simplify $(9-3)^2$ like $9^2-3^2=81-9=72$ and she put this in equation

$18 * 4^2+(9-3)^2$

$=18 * 16+9^2-3^2$

$=288+72$

$=360$ which is totally in correct.

because $(a+b)^2=a^2+b^2+2ab$ she use wrong property.

Answer 2

Answer: Lila is correct. Rob is wrong because he multiplied 18*4^2 and he gets 288 and then he added 81 and subtracted 9 and that gave him 360.

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Answers

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Answers

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Answers

Answer:

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Step-by-step explanation:

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Answer:

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Answers

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Answers

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