Question

If x= 3 is a solution of the equation 2x^2 + px = 15, find the value of P

Answer 1

Answer:

ɢɪᴠᴇɴ, ᴩ(x2+x)+ᴋ=0 ʜᴀꜱ ᴇqᴜᴀʟ ʀᴏᴏᴛꜱ.

        ꜱᴏ, ʙ2=4ᴀᴄ

         ᴩx2+ᴩx+ᴋ=0

         (ᴩ)2=4(ᴩ)(ᴋ)

         ᴩ=0,ᴏʀᴩ=4ᴋ

ᴀɴᴅ ɢɪᴠᴇɴ −5 ɪꜱ ʀᴏᴏᴛ ᴏꜰ 2x2+ᴩx−15=0

ᴩᴜᴛ x=−5

2(−5)2+(−5)ᴩ−15=0

50−5ᴩ−15=0

ᴩ=7

ᴩ=4ᴋ

7=4ᴋ

ᴋ=7/4