Write the equation 0.3x 2 + 5x - 7 = 0 in standard form and then choose the value of "b."

a.70
b.50
c.5

The answer is b = 50.

The general form of quadratic equation is
ax² + bx + c = 0.

To write the equation 0.3x² + 5x - 7 = 0 in standard form, you must get rid of decimals. To do that, multiply the equation by 10:
10 * (0.3x² + 5x - 7) = 10 * 0
10 * 0.3x² + 10 * 5x - 10 * 7 = 0
3x² + 50x - 70 = 0

Now compare this equation with the general formula:
ax² + bx  +   c  = 0
3x² + 50x - 70 = 0

Therefore, b = 50.

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