school
Acemy

Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 3/5

A rectangle has length x+3x+3 and width xx. If its area is 40, what is xx?

  • A

    44

  • B

    1010

  • C

    88

  • D

    55

    check_circle

Explanation

x(x+3)=40x(x+3) = 40, x2+3x−40=0x^2 + 3x - 40 = 0, (x+8)(x−5)=0(x+8)(x-5) = 0, x=5x = 5 (positive).

Want 10 more like this — adaptive to your weak spots?

Practice 10 like thisarrow_forwardPredict my AP score

Related questions

auto_awesomeAll Toolsquestion_answerHomework Q&Amenu_bookAP & SAT PreptimelineLearn Mode