The next step to the given step in factorizing of the expression is x ( x+12) -7 (x +12), the correct option is C.
What is an Expression?
An expression is a mathematical statement which consists of variables, constants and mathematical operators.
The expression is
x² + 5x − 84
The factors of a number is a number that completely divides the number it is a factor of.
The factors of an expression are the expressions, which when multiplied together will yield the original expression.
The first step in factorizing the expression is given,
x² + 5x − 84
x² + 12x - 7x − 84
After this the common terms will be taken out of the bracket.
x ( x+12) -7 (x +12)
(x-7) (x +12)
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