64x^2 + bx + 25 = 0; In the given equation, b is a constant. For which of the following values of...

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Bluebook Digital SAT Test 1 Module 2 (Hard) Question 15:

64x^2 + bx + 25 = 0; In the given equation, b is a constant. For which of the following values of b will the equation have more than one real solution?

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You are one of the best math teachers I have come across, but I really wish you didn't reverse the order of questions, example: Episode 22 has Question 1.

jeetmadhavi
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What if, we didn't have options.
How could we find the answer ?

THE_HORIZON
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using Demos calculator we can solve this!

MdAshraf