exam Maths Puzzle Numerical Ability

what is the solution to (x-y)(x+y)

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exam Other Question

Write the equation in either slope-intercept form or standard form:

The vertical line through the point(-45,61)
Determine the value/s of the variable where the expression is undefined :
-16 / j-3

Solve by factoring : x^2+3x+2

Factor Completely: 3x^3-3x^2-6x