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(1)x2 +x-20 = 0(4) 9y2-129+2=0 |
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Answer» 1. x² +X -20=0=> x² +5x -4x -20=0=> x(X+5)-4(X+5)=0=> (x-4)(X+5)=0=> X = 4, -5. 4. 9y² -12y +2 = 0=> y ={ +12±[(-12)² -4(9)(2)]½ }/2(9)=> y = [ 12± 6√2 ] / 18=> y = (2/3) ± (√2/3) Please hit the like button if this helped you out |
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