exam Maths Puzzle Numerical Ability

Explain why we cannot square a sum by simply squaring each term of the sum. For example, (a+b)square 2 is not equal to a square + b square. Provide appropriate example.

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6.Draw fractions of the circles on page 31 to confirm Check 2 to Example 1. Can someone help me solve this problem?

I need to solve for x and check the results:

-4(2x - 3) = -8x + 5

Thanks,
Sher