Asked by Raha

Twice the square of a certain whole number added to 3 times the number makes 90.Find the number.
Answered by asian boy
15?
Answered by Ms. Sue
15^2 = 225

The number can't be 15.

Answered by Nana
Word problems leading to quadratic equation
Answered by Blessing
Please help me solve this
Answered by Art
It's 6. 2 times 6 squared is 72, 3 times 6 is 18, and 72+18=90. If you don't know algebra, you could just guess and find out what number comes out to 90. If you do, use the quadratic formula. 2x^2+3x=90 x=(-3+/-sqrt((3^2)-4*2*(-90))/(2*2)=(-3+/-sqrt(729))/4=(-3+27)/4 or (-3-27)/4=6 or -7.5, and -7.5 isn't a whole number but 6 is.
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