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MATH / To calculate 42², Emily mentally figures the value 40² and adds 164. Emily subtracts a number from 40² to calculate 38². What number does she subtract?

Problem

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problem

To calculate 42242^2, Emily mentally figures the value 40240^2 and adds 164164. Emily subtracts a number from 40240^2 to calculate 38238^2. What number does she subtract?
Plain-text mathematical notation (without MathML)
To calculate 42², Emily mentally figures the value 40² and adds 164. Emily subtracts a number from 40² to calculate 38². What number does she subtract?
Original LaTeX notation
To calculate $42^2$, Emily mentally figures the value $40^2$ and adds $164$. Emily subtracts a number from $40^2$ to calculate $38^2$. What number does she subtract?

level

Level 2

type

Algebra

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Source and history

task_id
3251fddc-14d6-5b33-8958-934702045dcd
task_key
algebra--test--3251fddc-14d6-5b33-8958-934702045dcd
task_revision_id
1
config / split
algebra / test

Official source

initial import