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Basic Math
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Example
3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b
Question
$$(x-7)(x+7)$$
Evaluate
$x^{2}-49$
Solution Steps
Multiplication can be transformed into difference of squares using the rule: $\left(a-b\right)\left(a+b\right)=a^{2}-b^{2}$.
$$x^{2}-7^{2}$$
Calculate $7$ to the power of $2$ and get $49$.
$$x^{2}-49$$
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Expand
$x^{2}-49$
Solution Steps
Multiplication can be transformed into difference of squares using the rule: $\left(a-b\right)\left(a+b\right)=a^{2}-b^{2}$.
$$x^{2}-7^{2}$$
Calculate $7$ to the power of $2$ and get $49$.
$$x^{2}-49$$
Show Solution
Hide Solution
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