Question

VA ROG ESTE URGENT PROBLEMA 15!!!!!!!VA ROG AM NEVOIE URGENTA!!!!!!!!!​

Answer 1

$f(x)=-2x+\frac{3}{2}$

∩OX, y=0

$-2x+\frac{3}{2}=0\\\\2x=\frac{3}{2} \\\\x=\frac{3}{4}\\\\A(\frac{3}{4},0)$

∩OY, x=0

$y=\frac{3}{2}\\\\B(0,\frac{3}{2})$

Le reprezinti pe axa xOy

$f(3a+4)=a+\frac{1}{2}\\\\-2(3a+4)+\frac{3}{2}=a+\frac{1}{2}\\\\-12a-16+3=2a+1\\\\14a=-14\\\\a=-1$

$S=f(1)+f(2)+...+f(50)\\\\S=-2\times 1+\frac{3}{2}-2\times 2+\frac{3}{2}-..-2\times 50+\frac{3}{2}$

$\frac{3}{2}$ apare de 50 de ori

Dam factor comun -2

$S=-2(1+2+3+...+50)+\frac{3}{2}\times 50\\\\S=-50\times 51+75\\\\S=-2475$