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2x^{2}-7
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2x^{2}-7
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x^{2}-4+x^{2}-3
Consider \left(x+2\right)\left(x-2\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Square 2.
2x^{2}-4-3
Combine x^{2} and x^{2} to get 2x^{2}.
2x^{2}-7
Subtract 3 from -4 to get -7.
x^{2}-4+x^{2}-3
Consider \left(x+2\right)\left(x-2\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Square 2.
2x^{2}-4-3
Combine x^{2} and x^{2} to get 2x^{2}.
2x^{2}-7
Subtract 3 from -4 to get -7.
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