# Help with this question, keep getting it wrong - (3x+4)² - (x+7)(x-6) ?

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Expand and simplify:

(3x+4)² - (x+7)(x-6)

Expand and simplify:

(3x+4)² - (x+7)(x-6)

##### 2 Answers

#### Explanation:

Bracket the two products leaving the negation out side:

Expand inside the square brackets:

Now put these back in the square brackets:

Multiply inside the brackets by the negation, then remove brackets and simplify:

It is best practice to express this as:

This ensures that you do not lose negations when doing further calculations.

Negations before brackets often catch students out.

Hope this helps.