Factorising quadratics (Part 1)

Maths

Fill in the gap: ________ is the opposite of expanding.

A quadratic expression  x² + bx + 20 can be factorised. Find all the possible values for b when b is positive.

Which expression is equivalent to a² - b² ?

Match the expression equivalent to (x+4)(x-4).

Match the expression equivalent to (x+9)(x-3).

Which calculation would work out 64² - 4² ?

Match the expression equivalent to (x+25)-(x-25).

Match the expression equivalent to (73+x)(73-x).