5 x square - 4 x minus 7 is equal to zero solve quadratic equation
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5xsq. -4x-7
= -b+-✓b2-4ac/2a
= 4+✓16+35/10 , 4+✓16+35/10
=4+✓51/10, 4-✓51/10
answer is (4+✓51)/10, (4-✓51)/10
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