exam Maths Puzzle Numerical Ability

How would you factor out the greatest common factor in this problem?

21b^4-14b^2

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exam Other Question

Solve.

A triangle has sides 3x + 7, 4x - 9, and 5x + 6. Find the polynomial
that represents its perimeter.

Solve the problem: One number is 6 less than a second number. Twice
the second number is 48 more than 5 times the first. Find the two
numbers