Roopa and Noor try to simplify the expression 18 x 4 the power of 2 + (9-3) the power of 2. Roopa simplifies the expression and gets 360. Noor simplifies the expression and gets 324. Which student is correct? What error did the other student make?

Noor was correct while roopa was wrong. Roopa mistakenly squared both the value of 9 and 3 before taking the difference instead of subtracting 3 from 9 first and then squaring the result according to Noor.

Step-by-step explanation:

Noor simplifies the expression as thus;

Looking at the expression,

18×4²+(9-3)²

Using BODMAS, we will solve the one in the bracket first to have;

= 18×4² +6²

Afterward, we simplify the product (multiplication)

(18×4²)+6²

= 288+6²

= 288+36

Then finally we will add to have 324.

This gives the correct answer because the BODMAS rule was followed.

Roopa mistakenly simplify the expression as thus by squaring both values of 9 and 3 to give;

18×4²+(9²-3²)

18×4²+(81-9)

= 18×4²+(72)

= 288+72

= 360

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13