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Sagot :
2x² = -3² x 2 = 9 x 2 = 18
18 + -3 = 15 (as adding a negative means subtracting)
2x² + x = 15
18 + -3 = 15 (as adding a negative means subtracting)
2x² + x = 15
2*-3 is -6. then squared it is +36 and finally +-3 would get you to +33.
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