exam Maths Puzzle Numerical Ability

Explain (a+b)^2 not equal to a^2 + b^2

give a numerial example to illustrate

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exam Other Question

i dont realli no how 2 word this...but wats it mean if theres an exponent before a sq. root (not after)...u multiply the sq. root by the exponent? Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = -3x + 1. Please :)