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7.2b=2\times 45^{2}
Multiply both sides of the equation by 2.
7.2b=2\times 2025
Calculate 45 to the power of 2 and get 2025.
7.2b=4050
Multiply 2 and 2025 to get 4050.
b=\frac{4050}{7.2}
Divide both sides by 7.2.
b=\frac{40500}{72}
Expand \frac{4050}{7.2} by multiplying both numerator and the denominator by 10.
b=\frac{1125}{2}
Reduce the fraction \frac{40500}{72} to lowest terms by extracting and canceling out 36.