3 years ago

If ? A² + b² = 7b and b² + (2b-a) ²= 7², what is (a - b) ²?

Mathematics

1 answer:

exis [7]3 years ago

7 0

Answer:

7^2+2ab - 4b^2

Step-by-step explanation:

A² + b² = 7b

b² + (2b-a) ²= 7²

FOIL

b^2 +4b^2-4ba+a^2= 7^2

Rewriting

a^2 -2ab + b^2 +4b^2 -2ab = 7^2

Add 2ab and subtract 4b^2 from each side

a^2 -2ab + b^2 +4b^2 - 4b^2 -2ab+2ab = 7^2+2ab - 4b^2

a^2 -2ab + b^2 = 7^2+2ab - 4b^2

(a-b)^2 = 7^2+2ab - 4b^2

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There was a 48% increase from last year.

Step-by-step explanation:

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check:

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3 0

1 year ago

There are 7 students in a class: 2 boys and 5 girls. If the teacher picks a group of 333 at random, what is the probability that

bezimeni [28]

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