Use the power rule <math><mstyle displaystyle="true"><msup><mrow><mi>a</mi></mrow><mrow><mi>m</mi></mrow></msup><msup><mrow><mi>a</mi></mrow><mrow><mi>n</mi></mrow></msup><mo>=</mo><msup><mrow><mi>a</mi></mrow><mrow><mi>m</mi><mo>+</mo><mi>n</mi></mrow></msup></mstyle></math> to combine exponents.

Subtract <math><mstyle displaystyle="true"><mn>15</mn></mstyle></math> from <math><mstyle displaystyle="true"><mo>-</mo><mn>11</mn></mstyle></math> .

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