Question

evaluate the expression. x = 3 y = 5 5x^{2}-4y

Explanation:

Step1: Substitute x value

Substitute \(x = 3\) into \(x^{2}\), we get \(x^{2}=3^{2}=9\). Then calculate \(5x^{2}\), \(5x^{2}=5\times9 = 45\).

Step2: Substitute y value

Substitute \(y = 5\) into \(4y\), we get \(4y=4\times5=20\).

Step3: Calculate the result

Subtract the result of \(4y\) from \(5x^{2}\), \(5x^{2}-4y=45 - 20=25\).

Answer:

25