Question

Ginen [ begin{array}{r}x^{7}+14 x^{5}+16 x^{3}+30 x-560=0 -5(n)=7 x^{6}+70 x^{4}+48 x^{2}+30 x>0 text { fence } f(n) text { is monotonic } text { function }>1 t text { cuts } x text { anis only once }end{array} ] ( therefore ) If has one real solution

# low many real solution does the equation x?+ 14x5 +16x3 + 30x - 560 = 0 have? [AIE A) 1 (B)3 (D) 7 (C) 5 [30

Solution