Evaluate
\left(19x-6z\right)\left(5x+6z\right)
Expand
95x^{2}+84xz-36z^{2}
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12^{2}x^{2}-49x^{2}+84xz-36z^{2}
Expand \left(12x\right)^{2}.
144x^{2}-49x^{2}+84xz-36z^{2}
Calculate 12 to the power of 2 and get 144.
95x^{2}+84xz-36z^{2}
Combine 144x^{2} and -49x^{2} to get 95x^{2}.
12^{2}x^{2}-49x^{2}+84xz-36z^{2}
Expand \left(12x\right)^{2}.
144x^{2}-49x^{2}+84xz-36z^{2}
Calculate 12 to the power of 2 and get 144.
95x^{2}+84xz-36z^{2}
Combine 144x^{2} and -49x^{2} to get 95x^{2}.
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