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+ 28. 6x² + 17x+ 1230. 2x² + 11x - 2132. 21x2 + 5 - 634. 3x² - 14x +836. V5 x² + 2x - 3538. 7x² + 2/14x+240. 55x2 +20x +3.5142. V2 x + 3x + 244, 15x² -r - 2846. 2x² - 7x - 1548. 6² - 117 - 3550. 10x² - 9x-7 |
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Answer» 28.6x² + 17x+ 12=>6x^2+9x+8x+12=0=>3x(2x+3)+4(2x+3)=0=>(3x+4)(2x+3)=0=>3x+4=0 | 2x+3=0=> 3x =(-4) | 2x=(-3)=> x= (-4/3) | x=(-3/2)30. 2x² + 11x - 21=> 2x²+14x-3x-21=0=> 2x(x+7)-3(x+7) =0=> (2x-3)(x+7)=0=>(2x-3)=0 | (x+7)=0=>x = (3/2 ) | x =( -7)32. 21 x² + 5 x - 6=>21 x² + 5 x - 6=0=>21 x² + 14x - 9x - 6=0=> 7 ( 3 x + 2 ) - 3 ( 3 x + 2 )=0=>( 3 x + 2 ) ( 7 x - 3 )=0=>(3x+2)=0 | (7x-3)=0=> 3x=(-2) | 7x=3=> x=(-2/3)| x=7/334. 3x² - 14x +8=>3x²-12x-2x+8=0=>3x(x-4) -2(x-4)=0=>(3x-2)(x-4)=0=> 3x-2=0 | x-4=0=> x= (2/3) | x=438.7x² + 2√14x + 2=> 7x² + √14x + √14x + 2=0=> √7x(√7x + √2) + √2(√7x + √2)=0=> (√7x + √2)(√7x + √2)=0=> √7x+ √2=0 | √7x+ √2=0=> x=√2/√7 |
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