To evaluate the expression 2st^2 - s^2 for s = 4 and t = 8, we substitute s = 4 and t = 8 into the expression:
2st^2 - s^2 = 2(4)(8)^2 - (4)^2
= 2(4)(64) - 16
= 512 - 16
= 496
Therefore, when s = 4 and t = 8, 2st^2 - s^2 is equal to 496.
2st^2-s^2 for s=4 and t=8
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