Ответ:
f(7)=2*7^2+5*7+3=96+35+3=134
f(-4)=2*(-4)^2-5*4+3=32-20+3=15
2x^2+5x+3=6
2x^2+5x-3=0
x=(-5+-√(25+24))/4=(-5+-7)/4
x1=-3 x2=1/2
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Ответ:
f(7)=2*7^2+5*7+3=96+35+3=134
f(-4)=2*(-4)^2-5*4+3=32-20+3=15
2x^2+5x+3=6
2x^2+5x-3=0
x=(-5+-√(25+24))/4=(-5+-7)/4
x1=-3 x2=1/2