# Equation + expression of a variable from the formula - math problems

#### Number of problems found: 347

• Equation 23 Find value of unknown x in equation: x+3/x+1=5 (problem finding x)
• Simplify Simplify expression - which expression is equivalent to: 3(m + 2) − 4(2m − 9)
• Expression with powers If x-1/x=5, find the value of x4+1/x4
• Solve equation solve equation: ?
• Given Given 2x =0.125 find the value of x
• Hyperbola equation Find the hyperbola equation with the center of S [0; 0], passing through the points: A [5; 3] B [8; -10]
• Simple equation 3 24 = n • 27, solve for n
• Evaluation of expressions If a2-3a+1=0, find (i)a2+1/a2 (ii) a3+1/a3
• Parametric equation Find the parametric equation of a line with y-intercept (0,-4) and a slope of -2.
• The midpoint The midpoint of (2, 5) and (8, y) is (5, -1). Find the line equation in slope-intercept form.
• Height of the arc - formula Calculate the height of the arc if the length of the arc is 77 and chord length 40. Does exist a formula to solve this?
• Which Which decimals when subtracted equal 3.89: a - b = 3.89
• Sphere equation Obtain the equation of sphere its centre on the line 3x+2z=0=4x-5y and passes through the points (0,-2,-4) and (2,-1,1).
• Equation of circle 2 Find the equation of a circle that touches the axis of y at a distance of 4 from the origin and cuts off an intercept of length 6 on the axis x.
• Substitution method Solve goniometric equation: sin4 θ - 1/cos2 θ=cos2 θ - 2
• Roots and coefficient In the equation 2x ^ 2 + bx-9 = 0 is one root x1 = -3/2. Determine the second root and the coefficient b.
• Expressions 3 If k(x+6)= 4x2 + 20, what is k(10)=?
• Exponential equation Find x, if 625 ^ x = 5 The equation is exponential because the unknown is in the exponential power of 625
• Even / odd numbers a / Using variable n write two consecutive odd numbers. b / the sum of three consecutive odd numbers is 333. What are this numbers?
• Completing square Solve the quadratic equation: m2=4m+20 using completing the square method

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