Question

Solve this because I'm horrible at maths

Answer 1

$\tt \sqrt{1989 \times 1989 + 1989 \times 1989} + 13 - 2007$

• Write the repeated multiplication in exponential form

$\tt \sqrt{ {1989}^{2} + {1989}^{2} } + 13 - 2007$

• Collect like terms

$\tt \sqrt{2 \times {1989}^{2} } + 13 - 2007$

Simplify the radical expression

$\tt1989 \sqrt{2} + 13 - 2007$

Calculate the difference

$\tt1989 \sqrt{2} - 1994$

Calculate the approx value

$\tt \approx818.87$

Answer 2

Answer:

818.87

explanation:

$\hookrightarrow \sf \sqrt{1989\cdot 1989+1989\cdot 1989}+13-2007$

$\hookrightarrow \sf \sqrt{1989\cdot \:1989+1989\cdot \:1989}-1994$

$\hookrightarrow \sf 1989\sqrt{2}-1994$

$\hookrightarrow \sf 818.8707756$

$\hookrightarrow \sf 818.87$